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LEASES - Narrative (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Disclosure of finance lease and operating lease by lessee [line items]    
Depreciation method, right-of-use assets $ 50.1 $ 48.7
Short-term lease, low-value assets, and variable lease payments expenses 19.5 16.3
Net book value of property, plant and equipment leased under operating lease to third parties 58.2 72.8
Cost of sales    
Disclosure of finance lease and operating lease by lessee [line items]    
Depreciation method, right-of-use assets 47.8 47.0
Selling, general and administrative expenses    
Disclosure of finance lease and operating lease by lessee [line items]    
Depreciation method, right-of-use assets $ 2.3 $ 1.7